Abstract
This chapter discusses the design and implementation of a chopper current-feedback instrumentation amplifier (CFIA). This amplifier can be used in stand-alone sensor read-out systems that need to drive an external analog-to-digital converter (ADC). Firstly, the requirements on the amplifier are described. It is targeted for thermistor read-out applications in wafer steppers (see Chap. 1). The design of the CFIA is then discussed. Both the input and intermediate stages of the CFIA are chopped to achieve a low 1/f noise corner. To reduce chopper ripple, a continuous-time (CT) offset reduction loop (ORL) is proposed. Due to its CT nature, it does not cause noise folding, thus offering improved power efficiency over auto-zeroed amplifiers. It will be shown that this ORL can be applied to both general-purpose instrumentation amplifiers and operational amplifiers.
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Wu, R., Huijsing, J.H., Makinwa, K.A.A. (2013). A Chopper Instrumentation Amplifier with Offset Reduction Loop. In: Precision Instrumentation Amplifiers and Read-Out Integrated Circuits. Analog Circuits and Signal Processing. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3731-4_4
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DOI: https://doi.org/10.1007/978-1-4614-3731-4_4
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